/******************************************************************************
 * Copyright (c) 2024 Advanced Micro Devices, Inc. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 *****************************************************************************/

using namespace rocshmem;

/* Declare the template with a generic implementation */
template <typename T>
__device__ void wg_alltoall(rocshmem_ctx_t ctx, rocshmem_team_t team, T *dest,
                            const T *source, int nelem) {
  return;
}

/* Define templates to call rocSHMEM */
#define ALLTOALL_DEF_GEN(T, TNAME)                                           \
  template <>                                                                \
  __device__ void wg_alltoall<T>(rocshmem_ctx_t ctx, rocshmem_team_t team, \
                                 T * dest, const T *source, int nelem) {     \
    rocshmem_ctx_##TNAME##_wg_alltoall(ctx, team, dest, source, nelem);     \
  }

ALLTOALL_DEF_GEN(float, float)
ALLTOALL_DEF_GEN(double, double)
ALLTOALL_DEF_GEN(char, char)
// ALLTOALL_DEF_GEN(long double, longdouble)
ALLTOALL_DEF_GEN(signed char, schar)
ALLTOALL_DEF_GEN(short, short)
ALLTOALL_DEF_GEN(int, int)
ALLTOALL_DEF_GEN(long, long)
ALLTOALL_DEF_GEN(long long, longlong)
ALLTOALL_DEF_GEN(unsigned char, uchar)
ALLTOALL_DEF_GEN(unsigned short, ushort)
ALLTOALL_DEF_GEN(unsigned int, uint)
ALLTOALL_DEF_GEN(unsigned long, ulong)
ALLTOALL_DEF_GEN(unsigned long long, ulonglong)

rocshmem_team_t team_alltoall_world_dup;

/******************************************************************************
 * DEVICE TEST KERNEL
 *****************************************************************************/
template <typename T1>
__global__ void AlltoallTest(int loop, int skip, uint64_t *timer,
                             T1 *source_buf, T1 *dest_buf, int size,
                             ShmemContextType ctx_type, rocshmem_team_t team) {
  __shared__ rocshmem_ctx_t ctx;

  rocshmem_wg_init();
  rocshmem_wg_ctx_create(ctx_type, &ctx);

  int n_pes = rocshmem_ctx_n_pes(ctx);

  __syncthreads();

  uint64_t start;
  for (int i = 0; i < loop + skip; i++) {
    if (i == skip && hipThreadIdx_x == 0) {
      start = rocshmem_timer();
    }
    wg_alltoall<T1>(ctx, team,
                    dest_buf,    // T* dest
                    source_buf,  // const T* source
                    size);       // int nelement
  }

  __syncthreads();

  if (hipThreadIdx_x == 0) {
    timer[hipBlockIdx_x] = rocshmem_timer() - start;
  }

  rocshmem_wg_ctx_destroy(&ctx);
  rocshmem_wg_finalize();
}

/******************************************************************************
 * HOST TESTER CLASS METHODS
 *****************************************************************************/
template <typename T1>
AlltoallTester<T1>::AlltoallTester(
    TesterArguments args, std::function<void(T1 &, T1 &, T1)> f1,
    std::function<std::pair<bool, std::string>(const T1 &, T1)> f2)
    : Tester(args), init_buf{f1}, verify_buf{f2} {
  int n_pes = rocshmem_team_n_pes(ROCSHMEM_TEAM_WORLD);
  source_buf = (T1 *)rocshmem_malloc(args.max_msg_size * sizeof(T1) * n_pes);
  dest_buf = (T1 *)rocshmem_malloc(args.max_msg_size * sizeof(T1) * n_pes);
}

template <typename T1>
AlltoallTester<T1>::~AlltoallTester() {
  rocshmem_free(source_buf);
  rocshmem_free(dest_buf);
}

template <typename T1>
void AlltoallTester<T1>::preLaunchKernel() {
  int n_pes = rocshmem_team_n_pes(ROCSHMEM_TEAM_WORLD);
  bw_factor = sizeof(T1) * n_pes;

  team_alltoall_world_dup = ROCSHMEM_TEAM_INVALID;
  rocshmem_team_split_strided(ROCSHMEM_TEAM_WORLD, 0, 1, n_pes, nullptr, 0,
                               &team_alltoall_world_dup);
}

template <typename T1>
void AlltoallTester<T1>::launchKernel(dim3 gridSize, dim3 blockSize, int loop,
                                      uint64_t size) {
  size_t shared_bytes = 0;

  hipLaunchKernelGGL(AlltoallTest<T1>, gridSize, blockSize, shared_bytes,
                     stream, loop, args.skip, timer, source_buf, dest_buf, size,
                     _shmem_context, team_alltoall_world_dup);

  num_msgs = loop + args.skip;
  num_timed_msgs = loop;
}

template <typename T1>
void AlltoallTester<T1>::postLaunchKernel() {
  rocshmem_team_destroy(team_alltoall_world_dup);
}

template <typename T1>
void AlltoallTester<T1>::resetBuffers(uint64_t size) {
  int n_pes = rocshmem_team_n_pes(ROCSHMEM_TEAM_WORLD);
  for (int i = 0; i < n_pes; i++) {
    for (uint64_t j = 0; j < size; j++) {
      init_buf(source_buf[i * size + j], dest_buf[i * size + j], (T1)i);
    }
  }
}

template <typename T1>
void AlltoallTester<T1>::verifyResults(uint64_t size) {
  int n_pes = rocshmem_team_n_pes(ROCSHMEM_TEAM_WORLD);
  for (int i = 0; i < n_pes; i++) {
    for (uint64_t j = 0; j < size; j++) {
      auto r = verify_buf(dest_buf[i * size + j], i);
      if (r.first == false) {
        fprintf(stderr, "Data validation error at idx %lu\n", j);
        fprintf(stderr, "%s.\n", r.second.c_str());
        exit(-1);
      }
    }
  }
}